Hydraulic tilting device for trucks



June 19, 1934. o. BALLERT HYDRAULIC TILTING DEVICE FOR TRUCKS .Filed April 21, 1932 3 Sheets-Sheet 1 INV NTOR OTTOBA mf/w wm %W Y m June 19, 1934,. o. BALLERT 1,963,287.

HYDRAULIC TILTING DEVICE FOR 'TRUcKs Filed April .21, 1932 s Sheets-She et 2 N (***""""'*1 1 "I .1 1 I s 1 I I! 1 g N v I A f 5 ES- :5;

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INVENTORV OTToBALLERT- ATTORNEY June 19, 1934.

o. 'B ALLERT HYDRAULICTILTING DEVICE FOR TRUCKS 3 Sheets-Sheet 3 Filed April 21. 1932 YINVENTO R 01 TO BALLERT.

BY WW 7 .ATTGRNEY Patented June 19, 1934 HYDRAULIC TILTING DEVICE FOR TRUCKS Otto Ballert, Berlin, Germany Application April 21, 1932, Serial No. 606,658 In Germany February 25, 1929 2 Claims.

My invention relates to a hydraulic tilting-device for a truck body, especially the body ofa three-way tip wagon with a handor motordriven pump.

The hydraulic tilting-devices hitherto known,

in which the pump is united with the'tiltingdevice, are so arranged that the pump and the tilting-device in certain tilting motions move simultaneously. These devices have been made with a view to the maximum simplicity of mounting and the avoidance, as far as possible, of piping. This however has involved the disadvantage, that if the pump is to swing together with the tilting-device, an essentially larger size of oilreservoir is required than in the case of a pump' rigidly fixed, owing to the fact that when the pumpis brought into the tilted position the level of the oil is altered, and when the quantity of oil is small, the one suction-orifice lies higher than the surface of the oil. Moreover, the driving gear for a pump that swings together with the tiltingdevice is essentially more complicated than for a rigidly fixed one. This is especially troublesome in the case of a hand-driven pump, since the operating lever cannot conveniently and practically be arranged to move with the tiltingdevice, and the construction of mechanisms for rendering the movement of the operating lever independent is complicated and expensive.

In the present invention all these disadvantages are obviated. The invention consists in the fact, that the pump is rigidly connected with the bearing of the lifting-device, and the pressurefluid supply pipe is conducted axially in the manner known through the one pivot of the liftingdevice, the supply pipe being made as short as possible. The size of the oil-reservoir can be adapted exactly to the stroke volume; and the construction of the pump drive is simple and inexpensive.

In the drawings an embodiment of theinvention as a. three-way tilter is shown.

Fig. 1 shows a side-elevation of a three-way tilter,

Fig. 2 shows a plan view of the same,

Fig. 3 shows a section perpendicular to the lon- Situdinal axis of the truck.

Figure 4 is a detail plan of the pump and oil reservoir and amounting therefor, parts of the oil reservoir being broken away.

Figure 5 is a front end elevation of the pump and oil reservoir unit.

In the drawings, 1 designates the longitudinal chassis sills, 2 the tip body, on which the liftingdevice 3 engages in the known manner, as by a universal joint connection. The latter is here made as a one-piston device, and is suspended on a universal joint. between the cross members 4 and 5, which are rigidly connected with the chassis sills 1. The truck body is mounted on 0 bearings 7 and 8 in a sideways tiltable manner, and on bearing 9 in a backwards tiltable manner. 7

The pump mechanism 10 comprises a pump unit 10a and an oil reservoir 10b bolted together by bolts as 18. The pump mechanism 10 is con- 6 nected rigidly as by bolts 19 to suitable U-irons 16 and 17 which are in turn connected with the transverse chassis members 4 and 5 forming the mounting for the lifting device 3. Pump 10 is connected with the lifting-device 3 by a pipe 11 leading to the revolving pivot 12 of the universal joint suspension, the pivot revolving round the said pipe and being caulked suitably in regard thereto. Pipe 11 is continued further through the bore of the revolving pivot 12, leading to a pipe 13 which is conducted downward along the outside of the cylinder of the lifting-device into the bottom of the cylinder, so that the pressureoil is brought directly under the piston. 14 designates the pump-operating lever. This is inserted into a sleeve 15 attached pivotably to the pump and is so constructed that it serves at the same time to open the discharge valve lodged in the pump body and pressed by a spring (not shown) against the discharge orifice. This valve can also be arranged to act atthe same time as a safety-valve, so as to ensure the pressure not ex-- ceeding a certain height. As the pump and the lifting-device are connected by a firmly fixed pipe introduced into the revolving pivot of the liftingdevice, and as the pump is lodged rigidly on the frame of the chassis, it is possible to transfer the discharge valve to the pump, which was not hitherto feasible. The central location of the supply pipe moreover enables the whole pump unit and the drive gear to be so constructed as to form one closed-in whole unit, which, after the fastening- I screws or bolts 18 have been loosened, may without difficulty be withdrawn from the oil-reservoir.

I claim:

1. The combination with a vehicle frame and a body tiltable relative thereto, of a tilting device comprising a hydraulic hoist having pivo'tedconnections with said frame and body, respectively, 1 5 and a combined pump and fluid reservoir unit and connections from said unit forsupplying power to said hoist, said pump and reservoir unit comprising a reservoir shaped to constitute a base for stationarily mounting it upon said vehicle 11.0

frame, and a pump mounted upon said reservoir as a base, said pump being independent of other mounting connections to the vehicle frame.

2. The combination with a vehicle frame and a body tiltable relative thereto, of a tilting device comprising a hydraulic hoist having pivoted connections with said frame and body, respectively,

and a combined pump and fluid reservoir ,unit 

